Nice little add-on for Firefox from Mozilla - Ubiquity. Basically if you want to go from reading Guardian Unlimited to a particular page on Wikipedia, rather than go via a series of point-and-clicks through your browser's search bar you just press ctrl+space, raising a little black box on your browser, and type Wikipedia <some search term>:
This is just an early version, but I like the principle. It minimises the hassle of going from one particular webpage to another.
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